I'm currently using ZA 5.1 and may have found a possible bug on my WINME system. I never used to get any problems when booting up, but since using the above version (but I can't be absolutely sure if it completely coincided with this version install) I now sometimes (maybe 50% of boot ups) get the following error message. Explorer has caused an error in <unknown>. Explorer will now close. If you continue to experience problems try re-starting your computer. If I just ok the message... everything works fine. I then set about to disable all non essential startups in msconfig, and only when I stopped the ZA program from auto starting did I seem to stop this error. But I had to leave the True Vector startup otherwise ZA would not function correctly with a X in the tray icon after manual start. So all I have to do now is boot up with True Vector and then click the ZA quick launch to bring the program to life before net activity is entered into. So my question is... is this a known problem with this version at the moment which I see from other threads seems to be buggy. Has anyone else had this Explorer error on boot up with ZA auto starting fully. Any suggestions if ZA is not the cause (even though using this method of booting over a few days has not given the error once... yet) as to what else may be the cause of the error would be most welcome.